Antishimmy device



July 18, 1933. s. G, BAITS 1,918,445

ANTISHIMMY DEVICE Filed Sept. 19, 1931 2 Sheets-Sheet l FIEIVLQ INVEN-I-UR:

July 18, 1933. s. G. BAITS ANTISHIMMY DEVICE 2 Sheets-Sheet 2 Filed Sept. 19, 1951 by MA Q Z Q LA Patented July: 18, 1933 swam e. nm'rs or Gno'ssn mam 'rnnxj moment I; Assrenoaf'ro Henson: Mam i 1 043 woman; or pmnol'r," MICHIG NQ-A oonronn'rron'or :MI HIQAN; 3

:ANTISHIMMY DEVICE 1' Application-filed September 1-9, 1931.]=Ser;ia1 No. 563,7?6,

I This invention relates to motor tehic'les and more particularly to a construction and arrangernen't for the pivotally mounted? wheels which control'tlie direction-"of movement of g are 'mountedlso that the driver may swing fthem transversely to control the direction ofmovement of'the vehicle. For this" pur- .10 pose/these wheels are carried by' steering :knuc'kles which arepivotally mounted on ense aw l ev Ii 'Ste1f n'g pin le or, knuckles 11., and ,-l2-;ipivotall inountedj:

pins carried near opposite ends of one axle. The steerrngknuckle's are connected together and one is connected to the draglink of the steering mechanism. ii Since four-wheel I V and l8 are rotatably carri'ed steep brakes and balloon tireshave been adopted considerable trouble has been experienced due'to the tendency for the steering Wheels to shimmy. Constructions adopted to over- I 29 come this tendency have developed other troubles, particularly lack offcontrol of the "steering mechanism while applying thet 'hicle brakes.

' Itisanobject ofthe invention to proiiide l :a construction for ireducingthe ten denoyffor the steerin-g wheels to shimmy; i It'is' another object of the invention to provide a construction which will reduce the 'tend'ency'for thesteerin Wheels to shimmy and fW-hieh will render 't 1e steering mechagnism controllable particularly when apply -i'ng thebra kes'." lv a n 1 i i a The invention will be more clearly understood from the following description in con- 7 i'unction j with the accompanying: drawings -1n which; i i c J I :3 'Fig. 1 's '21 plan wiew of .the'f'ront iwheel "assembly of a'motor 'vehicle; i F-ig. 2 'isan elevational view of the same, ,eoipartly insection; 1 1' :1 Fig-(Boise fragmentary detail view p'a-rtly in section, of one of the parts; and I 1" Fig. is :a'seotional view taken upon the line 4-.4 of'Fig. 3.

Before explaining in detail the present invention, it is to be understood that the in:

vention is not limited in its application to the details of construction and arrangementoi parts illustrated in the accompanyingdrawings, since the invention is capable oi other {description and not of flimi'tat ir of the wheelsof a motor vehicle intended o "linntth'e' 1 vention" from "the arml25 intermediate. the ends-there- 1 .of.'. A; bolt Q28 passing freely throughfin "openingf29 in thelug p p arm 14. Aspri-ng 30 surrounds the lbei es with one end i engagement with a washerfil 5*abutting th othfilibnd ngagem t it a Washel: Pingh lu an; a. a

vn; and 'tifis 0 11 the' terms of theseveral claimsYhe ap-f pended asconsidered in.viewo oriart j and the requirements thereof r c nt a c iie gdfaw n e' n upon pivot pins 15 and oarriedby thejakle near opposite ends thereof; The whee'lsfl'fq;

ingk spindles ll 'fand 12 c respectively, flheu c' i gipl ew of wh ibmk Q f ssu e ably secured "to" each; offthe knuckles 111 and a l and :are rigidly fseoured thereto ably securedjin the usual? manner tothe flendflfi of the: arm .13. fllhe other {end ot v fthei {tiered ispivotally connected to one end of an; arm

;, the other bn'diof fwhioh is pi otauy secured to-the arm 14,

26 is: threaded in the abutting; the knuckle and the other end in engagement} with ,a washer 32 abutting the lug 26., v A spring-34 alsosurrounds thebolt 2 with a d en agem w th Wash head of the bolt 28 and the 'Thepoints (if-intersection of the .kingj pins iwith the' ground, lieouts'ide the 'pointsA which are the center of pressure of i the, tire on the ground. 1 When the brakes are applied the momentum of the car tends to carry the points tionof the tire'with the ground tendsto retard the movement ofthe patent A. There is therefor'e', 3i tendency for both h l wp/ B forward whiledthefrioj} i be turned inward, that is, to toe in. If there is a tendency to toe outionthe other hand as I Would be the case if the positions A and B- were reversed there would be a strong tend- :ency for the wheels to guide the car to the.

i right because the left wheel in a car having a left-hand steering-wheel isheld 'more firmly than, the right wheel, while the right'wheel -i s-freer to move. If the points A and B coincide, there is no strong tendency to swing the wheel in either direction and therefore the Wheel oscillates easily back and forth... By

arranging the parts as illustrated a tendency to toe in is produced which'is resisted only vbythe stiff spring 34. The tendencyto toe out,howe'ver, l is resisted by, thesoft spring with the 'resultithat all the parts] tend to -'"maintain substantiallyvideal conditions. ]I

find in practice that the arrangements embodying my invention substantially eliminate shimmy trouble. i

I claim:

1. In combination, vehicle axle, a pair ofvwheelspa pair of steering knuckles each rotatably receivlng one of said wheels, a pair 7 of pins carried by said axis each rotatably I receiving one of 'said'lniuckles, said pins bee I ing so arrangedwith respect to said Wheels that the projections of the axes of said pins intersect theareas of contact of said wheels with the surface supporting thefvehicle at points spaced'from and on opposite sides of i acting mo the centers ofsaidcontact areas, whereby said wheels tend to move transyerselyjin predetermined opposite directions, a connection between said knuckles permitting liinited trans-t verse'niovement'of one of said wheelsrela tive to thefother'including resilientmeans re forcibly in one direction than the other. 1

2; In combination, a vehicle "axle, a pair tween said knuckles permitting limited trans verse movement of one ,of sa d wheels relative to the other including refs ilient me'ans acting more forcibly in one direction than the other. J 1 3.In combination, a vehicle":axle',a pair of Wheels, a pair of steeringknucklesleach rotatably. receiving one of said wheels,- a pair of pins carried by said axle each rotatably supporting one of said knuckles, said pins being so arranged with respect to said wheels that the projections of the axes of said pins intersect the areas of contact of said Wheelsv with the surface supporting the vehicle'at 7 points spaced from and on oppositesidesof the centers of said contact areaswhereby said-wheels tend to move transversely in predetermined oposits directions, a connection between said nuckles permitting l mited independenttransverse movement 'of; said" Wheels including resilient means resisting said transverse movement. e 7 k v 4. In combination, a vehicle axle, a pair of wheels, a pair of steering kni'icklesv each rotatably receiving. one of said wheels, a pair of pins carried by Y said; axle each 'rot-at'ably supporting one of; said knuckles, the are jections of the axes of said pins intersecting the areas of contact of said Wheels and the surface s'u'pp rtinglthe vehicle outside the centers of said areas, a connect on between said knuckles permitting limited independ cut transverse ino'vement of said iwhe els ineluding resilient meansresisting said trans verse movement,

5.111 combination, a Vehicle axle, apair of wheels, a pair of steeringknuckles each Irotatably supporting one of said wheels, a pairoi pins 'carried'by' said; axle eachxrotatably receiving one of said knuckles, the projectionsoiithe axes said pins intersecting the areas of vcontact of said wheels and the surface supporting the vehicle outside the centers of said contact areas a' tie 'rod-con-f necting said knuckles, one ,of said knuckles being formed of at least two parts pivotally connected to permit limited relative {moveoppositely acting resilient 1ne1nhers, one of said members acting'more forcibly thanv the other. f I 1 i 6,. In combination, a vehicle axle, a pair-of steering knuckles, Wheels mountedv on said; 10

steering knuckles, king pins for the steering -ment 'and'held in their,normaljpositions by} knuckles, the projections of theaxes of said 1 pinsintersectingtheground at-points out sidethe centers of; contact of the surface supporting the vehicle, connections between. said knuckles permitting limited independ- 'ent movement of the wheels about the king pins, and resilient'means resisting said independent movement in both d rections, lithe means resisting the tendency to too out being weaker than that resisting :thetendency to toe in. a

" l STUART saris,

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